Stop Agile Scrum board from Auto-transitioning parent issues

Within the Agile Scrum board, if I transition all the sub tasks to "Completed" or whatever status is in the "Done" column, the Greenhopper board tries to transition the Parent issue to same column.

The issue is that we're trying to use Greenhopper in a way that means that the Sub-Tasks are the specific development tasks that are to be completed. When the Development tasks are completed, it's passed to the QA team (Within the same sprint) for them to test the story. Therefore the Story isn't completed at the same time as all the sub-tasks.

I can't change the way we work, so is there any way to stop Greenhopper from trying to auto-transition the issues?

I've read something that says I should get a prompt asking if I want to auto-transition, however, I don't, I get an error/info message saying that it can't transition the issues as there is no transition.

Is there anyway to maybe configure a dummy workflow transition that makes Greenhopper think it transitioned the issue (when it didn't), may be access permissions etc.